AAC definitions and structures that have been OKed from the SoC AAC decoder
[libav.git] / libavcodec / aac.h
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1/*
2 * AAC definitions and structures
3 * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
4 * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file aac.h
25 * AAC definitions and structures
26 * @author Oded Shimon ( ods15 ods15 dyndns org )
27 * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
28 */
29
30#ifndef FFMPEG_AAC_H
31#define FFMPEG_AAC_H
32
33#include "avcodec.h"
34#include "dsputil.h"
35#include "mpeg4audio.h"
36
37#include <stdint.h>
38
39#define AAC_INIT_VLC_STATIC(num, size) \
40 INIT_VLC_STATIC(&vlc_spectral[num], 6, ff_aac_spectral_sizes[num], \
41 ff_aac_spectral_bits[num], sizeof( ff_aac_spectral_bits[num][0]), sizeof( ff_aac_spectral_bits[num][0]), \
42 ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), sizeof(ff_aac_spectral_codes[num][0]), \
43 size);
44
45#define IVQUANT_SIZE 1024
46
47enum WindowSequence {
48 ONLY_LONG_SEQUENCE,
49 LONG_START_SEQUENCE,
50 EIGHT_SHORT_SEQUENCE,
51 LONG_STOP_SEQUENCE,
52};
53
54enum ChannelType {
55 AAC_CHANNEL_FRONT = 1,
56 AAC_CHANNEL_SIDE = 2,
57 AAC_CHANNEL_BACK = 3,
58 AAC_CHANNEL_LFE = 4,
59 AAC_CHANNEL_CC = 5,
60};
61
62/**
63 * main AAC context
64 */
65typedef struct {
66 AVCodecContext * avccontext;
67
68 /**
69 * @defgroup tables Computed / set up during initialization.
70 * @{
71 */
72 MDCTContext mdct;
73 MDCTContext mdct_small;
74 DSPContext dsp;
75 /** @} */
76
77 /**
78 * @defgroup output Members used for output interleaving and down-mixing.
79 * @{
80 */
81 float add_bias; ///< offset for dsp.float_to_int16
82 float sf_scale; ///< Pre-scale for correct IMDCT and dsp.float_to_int16.
83 int sf_offset; ///< offset into pow2sf_tab as appropriate for dsp.float_to_int16
84 /** @} */
85
86} AACContext;
87
88#endif /* FFMPEG_AAC_H */